@article{Griffiths_1965,
    doi = {10.1145/364914.364943},
    url = {https://doi.org/10.1145%2F364914.364943},
    year = {1965},
    month = {may},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {8},
    number = {5},
    pages = {289--300},
    author = {T. V. Griffiths and S. R. Petrick},
    title = {On the relative efficiencies of context-free grammar},
    journal = {Communications of the {ACM}}
}

@article{Griffiths_1965, doi = {10.1145/364914.364943}, url = {https://doi.org/10.1145%2F364914.364943}, year = {1965}, month = {may}, publisher = {Association for Computing Machinery ({ACM})}, volume = {8}, number = {5}, pages = {289--300}, author = {T. V. Griffiths and S. R. Petrick}, title = {On the relative efficiencies of context-free grammar}, journal = {Communications of the {ACM}} }